Diaphragm - The dome shaped muscle below the rib cage., Exhalation - The process in the figure is: , Trachea - Part A is called, relaxing - During this process muscle B is:, CO2 - Gas A is:, O2 - Gas B is:, E - Blood vessel that carry blood away from heart, A - a structure that is important to prevent backword movement of blood, B - Endothelium , D - Thin and wide vessel ,

Grade 12 Part 2

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